journal article Mar 23, 2022

Li2CO3/LiF‐Rich Heterostructured Solid Electrolyte Interphase with Superior Lithiophilic and Li+‐Transferred Characteristics via Adjusting Electrolyte Additives

View at Publisher Save 10.1002/aenm.202200337
Abstract
AbstractThe structure and components of solid electrolyte interphase (SEI) is crucial to direct the growth of lithium particles. However, it is hard to have control over them. Herein, an SEI that shares the properties of Li2CO3‐rich and LiF‐rich types is realized by using different fluorine phenylphospines, and constructing a Li2CO3/LiF‐rich heterostructured SEI by using tris(4‐fluorophenyl)phosphine (TFPP) as the electrolyte additive. The well‐balanced SEI formed in TFPP‐containing electrolyte has the fast Li+ transport kinetics of Li2CO3, good electron insulator capability of LiF, and strong affinity toward Li+. It can effectively guarantee fast, uniform Li+ flux through the SEI while preventing electrons from the Li anode entering into SEI, and thus realizes uniform and dense Li deposition at the SEI/Li interface. As expected, the Li anode with TFPP‐containing electrolyte achieves a stable Li plating/stripping over 400 h at 1mA cm−2 while the full cell with a high‐voltage LiNi0.6Co0.2Mn0.2O2 cathode also enables long‐term stability with a capacity retention (87.8% after 200 cycles) at 0.1 A g−1 and excellent rate performance.
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Published
Mar 23, 2022
Vol/Issue
12(18)
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Funding
National Natural Science Foundation of China Award: 51971090
Cite This Article
Daxiong Wu, Jian He, Jiandong Liu, et al. (2022). Li2CO3/LiF‐Rich Heterostructured Solid Electrolyte Interphase with Superior Lithiophilic and Li+‐Transferred Characteristics via Adjusting Electrolyte Additives. Advanced Energy Materials, 12(18). https://doi.org/10.1002/aenm.202200337